Hello guys!
This is my first thread in this forum. I am from Sweden so forgive me if my english is not perfect. I have an Audi A2 2001 with petrol 1.4 engine. I bought it very cheaply because it had a lot of faults. I was hoping I could fix it for my daughter who recently took her drivers license. I have spent a lot of time fixing everything and trying to find out whats is wrong with the engine. It is running badly (surging) on low throttle at constant speed. I also hesitates when you start from a traffic light. At high revs and speed and during accelleration it runs fine. There were two error codes intermittently for the oxygene sensor after the cat (now replaced) and 17961 (Barometric / Manifold Pressure Signals: Implausible Correlation). I have replaced a lot of sensors, ignition coil, spark plugs and cleaned the throttle body. Replaced EGR and even tried swapping to another throttle body and gas pedal sensor. I have cleaned the crank house ventilation and replaced the rubber hose. Replaced canister valve, intake manifold pressure sensor, cam speed sensor, crankshaft speed sensor, knocking sensor, new intake gaskets and injector gaskets because I thought it was some vacuum leak. I have also calibrated the throttle body with VCDS. Still it runs like crap.
A few days ago I checked the cam belt timing, and it was out of timing! Maybe this is the main cause? It seems like it has slipped a tooth. I knew I had to replace the cam belt soon, but my strategy was to get the motor running well first. The belt has never been replaced during 250 000 km (155 000 miles). Now I am afraid that the slipped cam belt may have caused damage to valves or pistons. I did a compression check and it was perfect. The engine is ticking rather heavily but I thought that was due to a bad hydraulic lifter.
Now to my question; Do I just replace the cam belt and set the timing right, or do I have to take the head off and check the status of the valves and pistons? Can the motor survive slipping a tooth on the cambelt without damage?
This is my first thread in this forum. I am from Sweden so forgive me if my english is not perfect. I have an Audi A2 2001 with petrol 1.4 engine. I bought it very cheaply because it had a lot of faults. I was hoping I could fix it for my daughter who recently took her drivers license. I have spent a lot of time fixing everything and trying to find out whats is wrong with the engine. It is running badly (surging) on low throttle at constant speed. I also hesitates when you start from a traffic light. At high revs and speed and during accelleration it runs fine. There were two error codes intermittently for the oxygene sensor after the cat (now replaced) and 17961 (Barometric / Manifold Pressure Signals: Implausible Correlation). I have replaced a lot of sensors, ignition coil, spark plugs and cleaned the throttle body. Replaced EGR and even tried swapping to another throttle body and gas pedal sensor. I have cleaned the crank house ventilation and replaced the rubber hose. Replaced canister valve, intake manifold pressure sensor, cam speed sensor, crankshaft speed sensor, knocking sensor, new intake gaskets and injector gaskets because I thought it was some vacuum leak. I have also calibrated the throttle body with VCDS. Still it runs like crap.
A few days ago I checked the cam belt timing, and it was out of timing! Maybe this is the main cause? It seems like it has slipped a tooth. I knew I had to replace the cam belt soon, but my strategy was to get the motor running well first. The belt has never been replaced during 250 000 km (155 000 miles). Now I am afraid that the slipped cam belt may have caused damage to valves or pistons. I did a compression check and it was perfect. The engine is ticking rather heavily but I thought that was due to a bad hydraulic lifter.
Now to my question; Do I just replace the cam belt and set the timing right, or do I have to take the head off and check the status of the valves and pistons? Can the motor survive slipping a tooth on the cambelt without damage?